Having come to Canada upon hearing the fake news that his biological mother Haruko is in critical condition, high school student Kaidou Haru meets a young boy named Ren. "You have a new brother. Take care of him." So instructed by his mother, Haru is forced to spend the summer with Ren. Every day is a battle with Ren, who refuses to listen to anybody. However, as Ren grows to like Haru little by little and Haru comes to adore Ren as well, they make a certain "promise"...
and he hasn't gone near the bathroom since.
y no volvió a acercarse
 a la bañera desde entonces.
y no volvió a acercarse
 a la bañera desde entonces.
il n’a plus jamais voulu
s’en approcher.
e da allora si è tenuto
alla larga dal bagno.
Depois disso, ele não chegava
mais perto do banheiro.